TREASURY UNITS (Details) (USD $)	0 Months Ended		6 Months Ended		70 Months Ended				0 Months Ended	1 Months Ended	0 Months Ended	6 Months Ended		70 Months Ended			0 Months Ended	1 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended		70 Months Ended	0 Months Ended	1 Months Ended			0 Months Ended	3 Months Ended	6 Months Ended		70 Months Ended	0 Months Ended	1 Months Ended
	Aug. 08, 2008	Aug. 20, 2007	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Mar. 06, 2008	Jan. 30, 2008	Jan. 15, 2008	Aug. 09, 2013 Subsequent event	Aug. 09, 2013 Subsequent event	Sep. 17, 2008 Class A Treasury Units	Jun. 30, 2013 Class A Treasury Units	Jun. 30, 2012 Class A Treasury Units	Jun. 30, 2013 Class A Treasury Units	Jan. 03, 2012 Class A Treasury Units	Aug. 20, 2007 Class A Treasury Units	Aug. 09, 2013 Class A Treasury Units Subsequent event	Aug. 09, 2013 Class A Treasury Units Subsequent event	Sep. 17, 2008 Class B Treasury Units	Jun. 30, 2013 Class B Treasury Units	Jun. 30, 2013 Class B Treasury Units	Jun. 30, 2012 Class B Treasury Units	Jun. 30, 2013 Class B Treasury Units	Aug. 09, 2013 Class B Treasury Units Subsequent event	Aug. 09, 2013 Class B Treasury Units Subsequent event	Jun. 30, 2013 Class B Treasury Units Harold Brown, the treasurer of the General Partner	Jun. 30, 2013 Class B Treasury Units Ronald Brown, the president of the General Partner	Sep. 17, 2008 General Partnership	Jun. 30, 2013 General Partnership	Jun. 30, 2013 General Partnership	Jun. 30, 2012 General Partnership	Jun. 30, 2013 General Partnership	Aug. 09, 2013 General Partnership Subsequent event	Aug. 09, 2013 General Partnership Subsequent event	Jun. 30, 2013 General Partnership Harold Brown, the treasurer of the General Partner	Jun. 30, 2013 General Partnership Ronald Brown, the president of the General Partner
Treasury units (in shares)			50,185		50,185							40,148		40,148						9,535	9,535		9,535						502	502		502
Period for repurchase of depository receipts	12 months	12 months
Depository receipts authorized to be repurchased (in shares)		300,000				1,500,000	900,000	600,000
Number of units in each depository receipt															0.03333	0.1
Fixed distribution percentage of unit holders												80.00%									19.00%									1.00%
Repurchase of depository receipts (in shares)					1,229,636				12,000	12,000		9,709		1,229,636						0	77		1,998						0	4		105
Repurchase price of depository receipts (in dollars per share)					$ 24.68				$ 41.50	$ 41.50
Repurchase price of units (in dollars per share)														$ 740.40			$ 1,245.00	$ 1,245.00					$ 627.53	$ 95	$ 95							$ 627.53	$ 5	$ 5
Issuance of treasury units (in shares)											6,642
Repurchase of units (in shares)			(404)	(86)															6,309									333
Repurchase of units			$ 399,487	$ 69,379	$ 31,786,000				$ 498,000	$ 498,000		$ 321,240	$ 55,778								$ 74,335	$ 12,921		$ 118,275	$ 118,275					$ 3,912	$ 680		$ 6,225	$ 6,225
Percentage of units owned by partners																										75.00%	25.00%								75.00%	25.00%